Size Effect of Insulating Nano-Inclusions in Y–Ba–Cu–O Bulk Superconductors Fabricated by Seeded Infiltration Growth
Size Effect of Insulating Nano-Inclusions in Y–Ba–Cu–O Bulk Superconductors Fabricated by Seeded Infiltration Growth
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DOI：
10.1007/s10948-010-0996-1
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发表时间：
2011
影响因子：
1.8
通讯作者：
N. Moutalbi;A. M’chirgui;J. Noudem
中科院分区：
文献类型：
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作者：
N. Moutalbi;A. M’chirgui;J. Noudem
我们对织构YBCO样品中钉扎中心尺寸对超导性能的影响进行了实验研究。在这项工作中，我们研究了绝缘夹杂物的加入对织构YBCO块材的超导和磁性能的影响。这项研究的目的是确定人工钉扎中心的大小是否能够影响我们样品的超导性质。为此，通过对纳米氧化铝分散体的轻微掺杂，成功地在YBCO基质中引入了两种不同粒径分布的绝缘纳米钉扎中心，即约20 nm和130 nm。用扫描电子显微镜(SEM)和SQUID研究了样品的微观结构和超导性能。结果表明，微量的纳米氧化铝夹杂物可以提高样品的钉扎能力。这项研究强调了钉扎力与钉扎中心大小的关系。
We have conducted an experimental study on the effect of the pinning centers size on the superconducting properties in textured YBCO samples. In this work, we investigated the effectiveness of the addition of an insulating inclusion on the superconducting and magnetic properties of textured YBCO bulk materials. The purpose of this study was to ascertain whether the size of artificial pinning centers is able to affect the superconducting properties of our samples. To this effect insulating nano-pinning centers with two different particle size distributions of about 20 nm and 130 nm have been successfully incorporated within YBCO matrix by slight doping with nano-particle alumina dispersions. The microstructure and superconducting properties were investigated by scanning electron microscopy (SEM) and SQUID. The results indicate that slight inclusions of nano-alumina can enhance the flux-pinning capability of samples. This study underlines the dependence of the pinning force on the size of the pinning centers.